如何在Flutter中将图像转换为文件? [英] How to convert Image to File in Flutter?

问题描述

我正在编写此flutter代码，其中图像"小部件中有图像，并且希望将其转换为文件"，以便可以将其上载到Firebase Storage.

  Image _image = Image.asset('assets \ images \ profile.png');文件_fileImage = convertToFile(_image);//将_fileImage上传到Firebase存储代码 

我需要 File convertToFile(Image img)函数.

解决方案

特别感谢 sami kanafani ./p>

这是我的解决方案(非常适合我):

  import'dart:async';导入'dart:io';导入'package:flutter/services.dart';导入'package:path_provider/path_provider.dart';类ImageUtils {静态Future< File>imageToFile({String imageName，String ext})异步{var bytes = await rootBundle.load('assets/$ imageName.$ ext');字符串tempPath =(await getTemporaryDirectory()).path;文件file = File('$ tempPath/profile.png');等待file.writeAsBytes(bytes.buffer.asUint8List(bytes.offsetInBytes，bytes.lengthInBytes));返回文件；}}class AnotherClass {文件imagePlaceHolder;_setPlaceHolder()异步{this.imagePlaceHolder =等待ImageUtils.imageToFile(imageName:"photo_placeholder"，ext:"jpg")；}...Image.file(this.imagePlaceHolder)，} 

I am writing this flutter code where I have Image in an Image widget and I want to convert it into File so that I can upload it to Firebase Storage.

Image _image = Image.asset('assets\images\profile.png');
File _fileImage = convertToFile(_image);
//upload _fileImage to Firebase Storage code

I need the File convertToFile(Image img) function.

解决方案

Special thanks to sami kanafani.

This is my solution (works perfectly for me):

import 'dart:async';
import 'dart:io';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';

class ImageUtils {
  static Future<File> imageToFile({String imageName, String ext}) async {
    var bytes = await rootBundle.load('assets/$imageName.$ext');
    String tempPath = (await getTemporaryDirectory()).path;
    File file = File('$tempPath/profile.png');
    await file.writeAsBytes(
        bytes.buffer.asUint8List(bytes.offsetInBytes, bytes.lengthInBytes));
    return file;
  }
}


class AnotherClass {
    File imagePlaceHolder;
    _setPlaceHolder() async {
         this.imagePlaceHolder = await ImageUtils.imageToFile(
         imageName: "photo_placeholder", ext: "jpg");
    }

    ...
    Image.file(this.imagePlaceHolder),
}

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